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Note Employee benefits (Breakdown of pension and OPEB plans assets and liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liabilities | $ 225 | $ 232
Non-current liabilities | 68,510 | 49,217
OPEB Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liabilities | 8,007 | 6,202
Non-current liabilities | $ 145,408 | $ 164,518

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